Composite bipolar lobe line profiles. All simulations used v_max| = 4000 km s^-1, i = 20°, and ballistic, constant mass ejecta. We use the notation, here and in Fig. 12, [θ₀,θ₁,ΔR/R,i] for the model parameters. The broad component (consistent with the epoch 1 data) has the parameters [5, 30, 0.5, 20], and is combined with a second consistent with the [O III] profile (see Fig. 7) with [50, 90, 0.2]. The relative weights of the two contributing profiles are indicated in each frame. See text for details.